1 /* 2 * imx-pcm-fiq.c -- ALSA Soc Audio Layer 3 * 4 * Copyright 2009 Sascha Hauer <s.hauer@pengutronix.de> 5 * 6 * This code is based on code copyrighted by Freescale, 7 * Liam Girdwood, Javier Martin and probably others. 8 * 9 * This program is free software; you can redistribute it and/or modify it 10 * under the terms of the GNU General Public License as published by the 11 * Free Software Foundation; either version 2 of the License, or (at your 12 * option) any later version. 13 */ 14 #include <linux/clk.h> 15 #include <linux/delay.h> 16 #include <linux/device.h> 17 #include <linux/dma-mapping.h> 18 #include <linux/init.h> 19 #include <linux/interrupt.h> 20 #include <linux/module.h> 21 #include <linux/platform_device.h> 22 #include <linux/slab.h> 23 24 #include <sound/core.h> 25 #include <sound/dmaengine_pcm.h> 26 #include <sound/initval.h> 27 #include <sound/pcm.h> 28 #include <sound/pcm_params.h> 29 #include <sound/soc.h> 30 31 #include <asm/fiq.h> 32 33 #include <linux/platform_data/asoc-imx-ssi.h> 34 35 #include "imx-ssi.h" 36 #include "imx-pcm.h" 37 38 struct imx_pcm_runtime_data { 39 unsigned int period; 40 int periods; 41 unsigned long offset; 42 struct hrtimer hrt; 43 int poll_time_ns; 44 struct snd_pcm_substream *substream; 45 atomic_t playing; 46 atomic_t capturing; 47 }; 48 49 static enum hrtimer_restart snd_hrtimer_callback(struct hrtimer *hrt) 50 { 51 struct imx_pcm_runtime_data *iprtd = 52 container_of(hrt, struct imx_pcm_runtime_data, hrt); 53 struct snd_pcm_substream *substream = iprtd->substream; 54 struct pt_regs regs; 55 56 if (!atomic_read(&iprtd->playing) && !atomic_read(&iprtd->capturing)) 57 return HRTIMER_NORESTART; 58 59 get_fiq_regs(®s); 60 61 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 62 iprtd->offset = regs.ARM_r8 & 0xffff; 63 else 64 iprtd->offset = regs.ARM_r9 & 0xffff; 65 66 snd_pcm_period_elapsed(substream); 67 68 hrtimer_forward_now(hrt, ns_to_ktime(iprtd->poll_time_ns)); 69 70 return HRTIMER_RESTART; 71 } 72 73 static struct fiq_handler fh = { 74 .name = DRV_NAME, 75 }; 76 77 static int snd_imx_pcm_hw_params(struct snd_pcm_substream *substream, 78 struct snd_pcm_hw_params *params) 79 { 80 struct snd_pcm_runtime *runtime = substream->runtime; 81 struct imx_pcm_runtime_data *iprtd = runtime->private_data; 82 83 iprtd->periods = params_periods(params); 84 iprtd->period = params_period_bytes(params); 85 iprtd->offset = 0; 86 iprtd->poll_time_ns = 1000000000 / params_rate(params) * 87 params_period_size(params); 88 snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer); 89 90 return 0; 91 } 92 93 static int snd_imx_pcm_prepare(struct snd_pcm_substream *substream) 94 { 95 struct snd_pcm_runtime *runtime = substream->runtime; 96 struct imx_pcm_runtime_data *iprtd = runtime->private_data; 97 struct pt_regs regs; 98 99 get_fiq_regs(®s); 100 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 101 regs.ARM_r8 = (iprtd->period * iprtd->periods - 1) << 16; 102 else 103 regs.ARM_r9 = (iprtd->period * iprtd->periods - 1) << 16; 104 105 set_fiq_regs(®s); 106 107 return 0; 108 } 109 110 static int imx_pcm_fiq; 111 112 static int snd_imx_pcm_trigger(struct snd_pcm_substream *substream, int cmd) 113 { 114 struct snd_pcm_runtime *runtime = substream->runtime; 115 struct imx_pcm_runtime_data *iprtd = runtime->private_data; 116 117 switch (cmd) { 118 case SNDRV_PCM_TRIGGER_START: 119 case SNDRV_PCM_TRIGGER_RESUME: 120 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: 121 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 122 atomic_set(&iprtd->playing, 1); 123 else 124 atomic_set(&iprtd->capturing, 1); 125 hrtimer_start(&iprtd->hrt, ns_to_ktime(iprtd->poll_time_ns), 126 HRTIMER_MODE_REL); 127 enable_fiq(imx_pcm_fiq); 128 break; 129 130 case SNDRV_PCM_TRIGGER_STOP: 131 case SNDRV_PCM_TRIGGER_SUSPEND: 132 case SNDRV_PCM_TRIGGER_PAUSE_PUSH: 133 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 134 atomic_set(&iprtd->playing, 0); 135 else 136 atomic_set(&iprtd->capturing, 0); 137 if (!atomic_read(&iprtd->playing) && 138 !atomic_read(&iprtd->capturing)) 139 disable_fiq(imx_pcm_fiq); 140 break; 141 142 default: 143 return -EINVAL; 144 } 145 146 return 0; 147 } 148 149 static snd_pcm_uframes_t snd_imx_pcm_pointer(struct snd_pcm_substream *substream) 150 { 151 struct snd_pcm_runtime *runtime = substream->runtime; 152 struct imx_pcm_runtime_data *iprtd = runtime->private_data; 153 154 return bytes_to_frames(substream->runtime, iprtd->offset); 155 } 156 157 static struct snd_pcm_hardware snd_imx_hardware = { 158 .info = SNDRV_PCM_INFO_INTERLEAVED | 159 SNDRV_PCM_INFO_BLOCK_TRANSFER | 160 SNDRV_PCM_INFO_MMAP | 161 SNDRV_PCM_INFO_MMAP_VALID | 162 SNDRV_PCM_INFO_PAUSE | 163 SNDRV_PCM_INFO_RESUME, 164 .formats = SNDRV_PCM_FMTBIT_S16_LE, 165 .rate_min = 8000, 166 .channels_min = 2, 167 .channels_max = 2, 168 .buffer_bytes_max = IMX_SSI_DMABUF_SIZE, 169 .period_bytes_min = 128, 170 .period_bytes_max = 16 * 1024, 171 .periods_min = 4, 172 .periods_max = 255, 173 .fifo_size = 0, 174 }; 175 176 static int snd_imx_open(struct snd_pcm_substream *substream) 177 { 178 struct snd_pcm_runtime *runtime = substream->runtime; 179 struct imx_pcm_runtime_data *iprtd; 180 int ret; 181 182 iprtd = kzalloc(sizeof(*iprtd), GFP_KERNEL); 183 if (iprtd == NULL) 184 return -ENOMEM; 185 runtime->private_data = iprtd; 186 187 iprtd->substream = substream; 188 189 atomic_set(&iprtd->playing, 0); 190 atomic_set(&iprtd->capturing, 0); 191 hrtimer_init(&iprtd->hrt, CLOCK_MONOTONIC, HRTIMER_MODE_REL); 192 iprtd->hrt.function = snd_hrtimer_callback; 193 194 ret = snd_pcm_hw_constraint_integer(substream->runtime, 195 SNDRV_PCM_HW_PARAM_PERIODS); 196 if (ret < 0) { 197 kfree(iprtd); 198 return ret; 199 } 200 201 snd_soc_set_runtime_hwparams(substream, &snd_imx_hardware); 202 return 0; 203 } 204 205 static int snd_imx_close(struct snd_pcm_substream *substream) 206 { 207 struct snd_pcm_runtime *runtime = substream->runtime; 208 struct imx_pcm_runtime_data *iprtd = runtime->private_data; 209 210 hrtimer_cancel(&iprtd->hrt); 211 212 kfree(iprtd); 213 214 return 0; 215 } 216 217 static int snd_imx_pcm_mmap(struct snd_pcm_substream *substream, 218 struct vm_area_struct *vma) 219 { 220 struct snd_pcm_runtime *runtime = substream->runtime; 221 int ret; 222 223 ret = dma_mmap_writecombine(substream->pcm->card->dev, vma, 224 runtime->dma_area, runtime->dma_addr, runtime->dma_bytes); 225 226 pr_debug("%s: ret: %d %p 0x%08x 0x%08x\n", __func__, ret, 227 runtime->dma_area, 228 runtime->dma_addr, 229 runtime->dma_bytes); 230 return ret; 231 } 232 233 static struct snd_pcm_ops imx_pcm_ops = { 234 .open = snd_imx_open, 235 .close = snd_imx_close, 236 .ioctl = snd_pcm_lib_ioctl, 237 .hw_params = snd_imx_pcm_hw_params, 238 .prepare = snd_imx_pcm_prepare, 239 .trigger = snd_imx_pcm_trigger, 240 .pointer = snd_imx_pcm_pointer, 241 .mmap = snd_imx_pcm_mmap, 242 }; 243 244 static int imx_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream) 245 { 246 struct snd_pcm_substream *substream = pcm->streams[stream].substream; 247 struct snd_dma_buffer *buf = &substream->dma_buffer; 248 size_t size = IMX_SSI_DMABUF_SIZE; 249 250 buf->dev.type = SNDRV_DMA_TYPE_DEV; 251 buf->dev.dev = pcm->card->dev; 252 buf->private_data = NULL; 253 buf->area = dma_alloc_writecombine(pcm->card->dev, size, 254 &buf->addr, GFP_KERNEL); 255 if (!buf->area) 256 return -ENOMEM; 257 buf->bytes = size; 258 259 return 0; 260 } 261 262 static int imx_pcm_new(struct snd_soc_pcm_runtime *rtd) 263 { 264 struct snd_card *card = rtd->card->snd_card; 265 struct snd_pcm *pcm = rtd->pcm; 266 int ret; 267 268 ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32)); 269 if (ret) 270 return ret; 271 272 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) { 273 ret = imx_pcm_preallocate_dma_buffer(pcm, 274 SNDRV_PCM_STREAM_PLAYBACK); 275 if (ret) 276 goto out; 277 } 278 279 if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) { 280 ret = imx_pcm_preallocate_dma_buffer(pcm, 281 SNDRV_PCM_STREAM_CAPTURE); 282 if (ret) 283 goto out; 284 } 285 286 out: 287 return ret; 288 } 289 290 static int ssi_irq = 0; 291 292 static int imx_pcm_fiq_new(struct snd_soc_pcm_runtime *rtd) 293 { 294 struct snd_pcm *pcm = rtd->pcm; 295 struct snd_pcm_substream *substream; 296 int ret; 297 298 ret = imx_pcm_new(rtd); 299 if (ret) 300 return ret; 301 302 substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream; 303 if (substream) { 304 struct snd_dma_buffer *buf = &substream->dma_buffer; 305 306 imx_ssi_fiq_tx_buffer = (unsigned long)buf->area; 307 } 308 309 substream = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream; 310 if (substream) { 311 struct snd_dma_buffer *buf = &substream->dma_buffer; 312 313 imx_ssi_fiq_rx_buffer = (unsigned long)buf->area; 314 } 315 316 set_fiq_handler(&imx_ssi_fiq_start, 317 &imx_ssi_fiq_end - &imx_ssi_fiq_start); 318 319 return 0; 320 } 321 322 static void imx_pcm_free(struct snd_pcm *pcm) 323 { 324 struct snd_pcm_substream *substream; 325 struct snd_dma_buffer *buf; 326 int stream; 327 328 for (stream = 0; stream < 2; stream++) { 329 substream = pcm->streams[stream].substream; 330 if (!substream) 331 continue; 332 333 buf = &substream->dma_buffer; 334 if (!buf->area) 335 continue; 336 337 dma_free_writecombine(pcm->card->dev, buf->bytes, 338 buf->area, buf->addr); 339 buf->area = NULL; 340 } 341 } 342 343 static void imx_pcm_fiq_free(struct snd_pcm *pcm) 344 { 345 mxc_set_irq_fiq(ssi_irq, 0); 346 release_fiq(&fh); 347 imx_pcm_free(pcm); 348 } 349 350 static struct snd_soc_platform_driver imx_soc_platform_fiq = { 351 .ops = &imx_pcm_ops, 352 .pcm_new = imx_pcm_fiq_new, 353 .pcm_free = imx_pcm_fiq_free, 354 }; 355 356 int imx_pcm_fiq_init(struct platform_device *pdev, 357 struct imx_pcm_fiq_params *params) 358 { 359 int ret; 360 361 ret = claim_fiq(&fh); 362 if (ret) { 363 dev_err(&pdev->dev, "failed to claim fiq: %d", ret); 364 return ret; 365 } 366 367 mxc_set_irq_fiq(params->irq, 1); 368 ssi_irq = params->irq; 369 370 imx_pcm_fiq = params->irq; 371 372 imx_ssi_fiq_base = (unsigned long)params->base; 373 374 params->dma_params_tx->maxburst = 4; 375 params->dma_params_rx->maxburst = 6; 376 377 ret = snd_soc_register_platform(&pdev->dev, &imx_soc_platform_fiq); 378 if (ret) 379 goto failed_register; 380 381 return 0; 382 383 failed_register: 384 mxc_set_irq_fiq(ssi_irq, 0); 385 release_fiq(&fh); 386 387 return ret; 388 } 389 EXPORT_SYMBOL_GPL(imx_pcm_fiq_init); 390 391 void imx_pcm_fiq_exit(struct platform_device *pdev) 392 { 393 snd_soc_unregister_platform(&pdev->dev); 394 } 395 EXPORT_SYMBOL_GPL(imx_pcm_fiq_exit); 396 397 MODULE_LICENSE("GPL"); 398